Make unit_tests pass with pt_BR.UTF-8 locale.

base/string_util.h

Index: base/string_util.h
===================================================================
--- base/string_util.h	(revision 5165)
+++ base/string_util.h	(working copy)
@@ -127,6 +127,14 @@
 // Names of codepages (charsets) understood by icu.
 extern const char* const kCodepageUTF8;
 
+// When some function takes an optional parameter to control locale
+// independence, you should use values from here to make function call
+// look more descriptive.
+enum LocaleDependence {
+  LOCALE_DEPENDENT = true,
+  LOCALE_INDEPENDENT = false
+};
+
 // Removes characters in trim_chars from the beginning and end of input.
 // NOTE: Safe to use the same variable for both input and output.
 bool TrimString(const std::wstring& input,
@@ -354,6 +362,9 @@
 std::string Uint64ToString(uint64 value);
 std::wstring Uint64ToWString(uint64 value);
 
+std::string DoubleToString(double value, LocaleDependence locale_dependent);
+std::wstring DoubleToWString(double value, LocaleDependence locale_dependent);
+
 // Perform a best-effort conversion of the input string to a numeric type,
 // setting |*output| to the result of the conversion.  Returns true for
 // "perfect" conversions; returns false in the following cases:
@@ -376,8 +387,14 @@
 // numbers in hexadecimal, and strings representing non-fininte values (such
 // as NaN and inf) is undefined.  Otherwise, these behave the same as the
 // integral variants above.
+//
+// By default, locale-dependent variant is used.
 bool StringToDouble(const std::string& input, double* output);
+bool StringToDouble(const std::string& input, double* output,
+                    LocaleDependence locale_dependent);
 bool StringToDouble(const std::wstring& input, double* output);
+bool StringToDouble(const std::wstring& input, double* output,
+                    LocaleDependence locale_dependent);
 
 // Convenience forms of the above, when the caller is uninterested in the
 // boolean return value.  These return only the |*output| value from the
@@ -388,8 +405,13 @@
 int64 StringToInt64(const std::wstring& value);
 int HexStringToInt(const std::string& value);
 int HexStringToInt(const std::wstring& value);
+// By default, locale-dependent variant is used.
 double StringToDouble(const std::string& value);
+double StringToDouble(const std::string& value,
+                      LocaleDependence locale_dependent);
 double StringToDouble(const std::wstring& value);
+double StringToDouble(const std::wstring& value,
+                      LocaleDependence locale_dependent);
 
 // Return a C++ string given printf-like input.
 std::string StringPrintf(const char* format, ...);